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    <title>Document</title>
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        <h2>一台钢琴</h2>
        <div class="column volume-slider">
          <span>音量</span>
          <input type="range" min="0" max="1" value="0.5" step="any" />
        </div>
        <div class="column keys-checkbox">
          <span>按键</span> <input type="checkbox" checked />
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      <ul class="piano-keys">
        <li class="key white" data-key="a"><span>a</span></li>
        <li class="key black" data-key="w"><span>w</span></li>
        <li class="key white" data-key="s"><span>s</span></li>
        <li class="key black" data-key="e"><span>e</span></li>
        <li class="key white" data-key="d"><span>d</span></li>
        <li class="key white" data-key="f"><span>f</span></li>
        <li class="key black" data-key="t"><span>t</span></li>
        <li class="key white" data-key="g"><span>g</span></li>
        <li class="key black" data-key="y"><span>y</span></li>
        <li class="key white" data-key="h"><span>h</span></li>
        <li class="key black" data-key="u"><span>u</span></li>
        <li class="key white" data-key="j"><span>j</span></li>
        <li class="key white" data-key="k"><span>k</span></li>
        <li class="key black" data-key="o"><span>o</span></li>
        <li class="key white" data-key="l"><span>l</span></li>
        <li class="key black" data-key="p"><span>p</span></li>
        <li class="key white" data-key=";"><span>;</span></li>
      </ul>
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